Magneto.



O. H. LEMKE.

MAGNETO.

APPLICATION FILED JULY 2, 101s.

1,125,849. Patented Jan.19,1915.

UNITED STATES PATENT OFFICE.

OERTEL H. LEMKE, 0F MILWAUKEE, WISCONSIN.

MAGNE'IO.

Application filed July 2, 1913.

To all whom it may concern Be it known that I, OERTEL H. LEMKE, acitizen of the United States, residing at Milwaukee, in the county ofMilwaukee and State of Wisconsin, have invented new and usefulImprovements in Magnetos, of which the following is a specification.

This invention relates to electric generators of the magneto type usedfor producing current for ignition in internal combustion engines. g

It is a purpose to improve the construction and arrangement of the partswhereby the reversal of the internal combustion engine will not resultin impairing the efficiency of ignition when a magneto of this type isemployed.

important object of the invention is to simplify the construction of'thetiming, commutator and circuit breaking mechanism, whereby it will becheap to manufacture, and will be liable in a minimum degree toderangement in use.

Additional objects and advantages will appear from the followingdescription and from the drawings, in which,

Figure 1, is an elevation of a magneto constructed in accordance with myinvention, in position for forward operation of an engine. Fig. 2, is alongitudinal sectional view of the magneto.

There is illustrated a shaft 10 which may be operated in conjunctionwith an internal combustion engine in the familiar way, these detailsbeing-so well understood in the art that they are not illustrated. Or,the shaft 10 may be a continuation of the crank shaft of the engine, asmy invention is such as to enable this type of magneto to be mounteddirectly on the engine shaft, saving the necessity for additionalbearings, and the extra shaft and operative connections. The necessaryparts may be built in the engine casing or frame, and the fly wheel, orin any independent magneto to be used with a reversing engine. Theparticular magneto here illustrated as one of the possible embodimentsof my invention is of the familiar type, in which a non-rotatingarmature 11 and field is used, and the field is caused to oscillate byrotating iron wings 12 carried on the shaft 10. The armature isconcentric with the shaft, and the field is produced by permanentmagnets 13 embracing the armature. The magnets Specification of LettersPatent.

Patented Jan. 19, 1915.

Serial No. 776,950.

13 embracing the armature. The magnets are formed of thin stamped sheetsteel blanks of any suitable number fixed together and are supported forpivotal movement on the shaft by means of suitable bearing brackets 13'mounted onthe shaft 10 as shown, or otherwise. Secured to the shaftadjacent the magnets there is an interrupter cam 14 of ordinary typecomprising a collar having a concentric periphery interrupted by aneccentric lug 15 at one point.

An advance, retard and reverse lever 16 is Provided having a collar 17at its lower end engaged revolubly on the shaft, the lever being tangentthereto and extending up beside the bight 18 of the adjacent magnet. Thelever is provided with a spring pressed pin 19 projected toward themagnets and adapted to engage alternatively in the sockets 20 and 21formed in the plate 28 on the magnet, whereby the lever may be heldadjustably in either of two positions with relation to the magnets, fora purpose to be explained. Loosely pivoted on the lever there is a brusharm 22 having a nib or finger 23 at its lower end adjusting screw 27 onthe lever. The screw 27 is engaged in a bushing 28 fixed on the leverand suitably insulated, and a wire 29 leads therefrom to the armature.The screw 27 is adjusted to bear upon the spring with the arm 22 at theinner limit of its movement on the lever but is suiiiciently rigid andlimited in action to allow it to swing out from the contact 26 when thenib encounters the eccentric 15 on the cam. By means of the wire 29 aground is made through the arm 22, and a wire 30 leads from the oppositeterminal to the coil or igniter, as the case may be, this circuit beingwell understood.

The principles of generating and using the current in all magnetosconstructed in accordance with my invention, either of the no high orlow tension type is the same as are involved in the ordinary forms ofgenerators.

It will be understood that the cam is so timed in its movement that thebreak maytime of ignition, the magnets are also moved, on their bearingsand the break always occurswhen the most eflicient spark will beproduced. Any customary means may be provided for holding the lever andmagnets in their various positions for timing the spark. The socket 21is so positioned that by shifting the lever, the relation of the wingsand magnets will be such as to produce the most efficient spark shouldthe engine and shaft 10 be reversed. It will be seen that the spark maybe advanced and retarded with the engine running in either directionwithout diminished efiiciency therein. I i

It will be appreciated that the principle of construction of thisinvention may be utilizedin either high or low tension devices, and mayalso be applied to 'magnetos having-ordinary rotating armatures which itis believed will be sufiiciently understood without specificillustration. Also the current may be distributed by any customarycommutator construction to a plurality of spark plugs.

- In the event that. the deviceis used on a built-in dynamo, and amultiplicity of stawitnesses.

whereby it may be rotated concentrically,

means for causing relative movement of the field and armature, a camsynchronously operative with said last named means, a lever pivotedconcentrically with the pivotal axis of the field, an interrupter devicemovable by the lever operatively connected with the cam, and adjustableconnections between the lever and field, producing means for adjustmentof the relations of the field and interrupter, and synchronous movementof the field and interrupter in their various adjusted relations.

2. In a magneto of the class described a pivoted magnet movable in thearc of relative movement of armature and field, an interrupter devicefor interrupting the current generated, means for timing the action ofthe interrupter, including a lever pivoted on a common axis with themagnet pivot and" closely adjacent the magnet, a spring pressed slidingpin engaged through the lever, sockets being fornfed in the magnetspaced concentrically from its pivot to receive an end of the pin.

In testimony whereof I have hereunto set my hand in presence of twosubscribing OERTEL H. LEMKE. Witnesses:

PAUL HEMPEL,

J. J. ScHIssLER.

